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 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.plaf.synth;

import java.awt.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import sun.swing.DefaultLookup;

/**
 * Provides the Synth L&amp;F UI delegate for
 * {@link javax.swing.JOptionPane}.
 *
 * @author James Gosling
 * @author Scott Violet
 * @author Amy Fowler
 * @since 1.7
 */
public class SynthOptionPaneUI extends BasicOptionPaneUI implements
    PropertyChangeListener, SynthUI {

  private SynthStyle style;

  /**
   * Creates a new UI object for the given component.
   *
   * @param x component to create UI object for
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent x) {
    return new SynthOptionPaneUI();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installDefaults() {
    updateStyle(optionPane);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installListeners() {
    super.installListeners();
    optionPane.addPropertyChangeListener(this);
  }

  private void updateStyle(JComponent c) {
    SynthContext context = getContext(c, ENABLED);
    SynthStyle oldStyle = style;

    style = SynthLookAndFeel.updateStyle(context, this);
    if (style != oldStyle) {
      minimumSize = (Dimension) style.get(context,
          "OptionPane.minimumSize");
      if (minimumSize == null) {
        minimumSize = new Dimension(262, 90);
      }
      if (oldStyle != null) {
        uninstallKeyboardActions();
        installKeyboardActions();
      }
    }
    context.dispose();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallDefaults() {
    SynthContext context = getContext(optionPane, ENABLED);

    style.uninstallDefaults(context);
    context.dispose();
    style = null;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallListeners() {
    super.uninstallListeners();
    optionPane.removePropertyChangeListener(this);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installComponents() {
    optionPane.add(createMessageArea());

    Container separator = createSeparator();
    if (separator != null) {
      optionPane.add(separator);
      SynthContext context = getContext(optionPane, ENABLED);
      optionPane.add(Box.createVerticalStrut(context.getStyle().
          getInt(context, "OptionPane.separatorPadding", 6)));
      context.dispose();
    }
    optionPane.add(createButtonArea());
    optionPane.applyComponentOrientation(optionPane.getComponentOrientation());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  private int getComponentState(JComponent c) {
    return SynthLookAndFeel.getComponentState(c);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    SynthLookAndFeel.update(context, g);
    context.getPainter().paintOptionPaneBackground(context,
        g, 0, 0, c.getWidth(), c.getHeight());
    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component according to the Look and Feel.
   * <p>This method is not used by Synth Look and Feel.
   * Painting is handled by the {@link #paint(SynthContext, Graphics)} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void paint(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component. This implementation does nothing.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    context.getPainter().paintOptionPaneBorder(context, g, x, y, w, h);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void propertyChange(PropertyChangeEvent e) {
    if (SynthLookAndFeel.shouldUpdateStyle(e)) {
      updateStyle((JOptionPane) e.getSource());
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected boolean getSizeButtonsToSameWidth() {
    return DefaultLookup.getBoolean(optionPane, this,
        "OptionPane.sameSizeButtons", true);
  }

  /**
   * Called from {@link #installComponents} to create a {@code Container}
   * containing the body of the message. The icon is the created by calling
   * {@link #addIcon}.
   */
  @Override
  protected Container createMessageArea() {
    JPanel top = new JPanel();
    top.setName("OptionPane.messageArea");
    top.setLayout(new BorderLayout());

        /* Fill the body. */
    Container body = new JPanel(new GridBagLayout());
    Container realBody = new JPanel(new BorderLayout());

    body.setName("OptionPane.body");
    realBody.setName("OptionPane.realBody");

    if (getIcon() != null) {
      JPanel sep = new JPanel();
      sep.setName("OptionPane.separator");
      sep.setPreferredSize(new Dimension(15, 1));
      realBody.add(sep, BorderLayout.BEFORE_LINE_BEGINS);
    }
    realBody.add(body, BorderLayout.CENTER);

    GridBagConstraints cons = new GridBagConstraints();
    cons.gridx = cons.gridy = 0;
    cons.gridwidth = GridBagConstraints.REMAINDER;
    cons.gridheight = 1;

    SynthContext context = getContext(optionPane, ENABLED);
    cons.anchor = context.getStyle().getInt(context,
        "OptionPane.messageAnchor", GridBagConstraints.CENTER);
    context.dispose();

    cons.insets = new Insets(0, 0, 3, 0);

    addMessageComponents(body, cons, getMessage(),
        getMaxCharactersPerLineCount(), false);
    top.add(realBody, BorderLayout.CENTER);

    addIcon(top);
    return top;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected Container createSeparator() {
    JSeparator separator = new JSeparator(SwingConstants.HORIZONTAL);

    separator.setName("OptionPane.separator");
    return separator;
  }
}
